| 摘要 |
PROBLEM TO BE SOLVED: To provide an internal gear pump capable of improving quietness.SOLUTION: An internal gear pump comprises an inner rotor 2a having external teeth rotated and driven by a drive shaft (shaft 30) and an outer rotor 2b having internal teeth inserted with play in a pump storage hole 400 formed in a housing 4 (first housing 4a) so as to be engaged with the inner rotor 2a. A predetermined range (tooth tip 21) in the circumferential direction on the tooth tip side of the tooth surface of the inner rotor 2a is formed into a curved shape with a distance from the axis (shaft center O) of the inner rotor 2a gradually shortened from the axis direction center toward the axis direction end face of the inner rotor 2a. |
